JPH03287880A - Leather-like sheet material - Google Patents

Abstract

PURPOSE:To obtain the subject excellent sheet having low resiliency, high soft ness and massive feeling by laminating a layer containing specific collagen powder, etc., and a layer containing a specific component to the coating surface of a sheet composed of a substrate layer and a coating layer made of an elastic polymer. CONSTITUTION:A leather-like sheet similar to natural leather and having low resiliency, high softness, slimy feeling and excellent surface scratch resistance and abrasion resistance, etc., by preparing a sheet material consisting of a substrate layer composed of e.g. a polyurethane elastomer and a fiber aggregate (e.g. nonwoven cloth composed of entangled fibers) and a polyurethane elastomer coating layer applied to one surface of the substrate layer and laminating a layer composed of nonfibrous collagen powder having an average particle diame ter of <=10mum and an apparent bulk density of 0.1-0.3g/cm<3> and a polymer com posed mainly of a polyurethane and a layer composed of a polyurethane and/or acrylic resin, an oil and fat and casein to the coating surface of the above sheet material.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention has a surface that has low repulsion, is flexible, feels slimy to the touch, and has a solid appearance similar to natural leather. The present invention relates to a leather-like sheet material with deep texture and color and excellent surface strength, and a method for producing the same.

<Conventional technology> Conventionally, leather-like sheet materials having a coating layer of a polymer mainly composed of polyurethane on the surface of a base material mainly composed of fibers have a low resilience, are flexible, and have a slimy feel to the touch. There are many proposals for leather-like sheets that have a textured surface and excellent surface strength. In particular, we focused on improving the shape of folds and wrinkles on the surface, the feel to the hand, and the resilience.
The structure and composition of leather-like sheets, the raw materials used, manufacturing conditions, etc. have been studied. For example, in terms of the structure and constitution of a leather-like sheet, the porous surface of a honeycomb-like porous structure with an average diameter of about 20 to 200 μm is ground, and the epidermis (skin layer)
A leather-like sheet-like material is produced by removing the bubbles so that the diameter of most of the bubbles on the exposed surface becomes 10 μm or more, and forming a polymer coating layer on the exposed surface of the bubbles to give a so-called silver surface finish. This method is proposed in Japanese Patent Publication No. 47-38623 and Japanese Patent Publication No. 54-963. Furthermore, the present applicant applied a polyurethane solution to the surface of a surface layer with a porous structure having a large number of microholes with a pore size of 3 to 1100 μm on the surface, and shaped the microholes to form a fine pore surface. A leather-like sheet material having microholes is disclosed in Japanese Patent Publication No. 10345/1983 and Japanese Patent Publication No. 56/1983.
This is proposed in Publication No. 0346.

Furthermore, many attempts have been made to reproduce the appearance and texture similar to natural leather by mixing natural leather powder, collagen, etc. into the coating layer of a leather-like sheet.

For example, Japanese Patent Publication No. 63-23644, Japanese Patent Publication No. 63-3
15677 and the like. These leather-like sheets are simply mixed with large-sized leather powder or collagen powder, and the surface has a rough and dry feeling due to the powder, and does not have the slimy feel of natural leather. .

<Problems to be Solved by the Invention> It is possible to improve the appearance performance of conventional leather-like sheet materials, for example, by making the folding wrinkle form similar to that of natural leather, by improving the drapability to obtain a solid appearance, and by improving the appearance performance. In terms of performance, the focus was on improving air permeability and moisture permeability. However, although conventional leather-like sheet materials are flexible, they have a dry and dry feel to the touch. Therefore, in order to produce a leather-like sheet material with a slimy, flexible texture and feel, treatments are carried out with softeners, plasticizers, or oils to improve the texture. It is not preferable to improve the feel by using only a processing agent, as the stickiness characteristic of the processing agent may occur, and over a long period of time, the processing agent may bleed or have an unfavorable effect on the polyurethane.

On the other hand, on the surface of a conventional leather-like sheet material having a porous layer or a non-porous layer, for example, a composition of a flexible polymer or a treatment agent such as a flexible polymer and an oil or fat can be applied without removing the skin layer. If a substance is applied, the frictional resistance on the surface increases, resulting in poor wear resistance or decreased heat resistance, which is undesirable. Furthermore, problems such as poor moldability due to surface embossing occur.

The present invention has a surface that has a low rebound feeling, is flexible, has a slimy feel without tackiness to the touch, and has excellent scratch strength, abrasion strength, breaking strength of the surface layer, etc. ,
To provide a leather-like sheet-like material having a surface and fold wrinkle form similar to natural leather, and having visual performance such as a feeling of solidity and softness.

Means for Solving the Problems> The present invention provides a leather-like sheet comprising a base layer containing a polymer mainly composed of an elastic polymer in a fiber aggregate and a coating layer composed of a polymer mainly composed of an elastic polymer. In the surface of the coating layer, a non-fibrous layer consisting of a polymer mainly composed of collagen powder and polyurethane with an average particle size of 10 μm or less and an apparent bulk density of 0.1 to 0.3 g/cm” is provided on the surface of the coating layer. , a leather-like sheet material characterized by laminated layers of polyurethane and/or acrylic resin, oil and fat, and casein, and further comprising acrylic resin or polyurethane, nitrified cotton lacquer, and oil on the surface. It is a leather-like sheet material characterized by being made up of laminated layers.

That is, the present invention relates to fiber aggregates such as woven fabrics, knitted fabrics, or fiber entangled non-woven fabrics made of any of ordinary fibers, ultrafine fibers and/or bundled fibers thereof, special porous fibers, etc. , polyurethane, acrylic polymer, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, and other synthetic rubbers. A base layer consisting of a polymer mainly composed of an elastomeric polymer and a fiber aggregate, obtained by containing a polymer mainly composed of an elastomeric polymer such as polyurethane or plasticized polyvinyl chloride on the surface of the base layer. A sheet-like material with a porous layer or a non-porous layer as a surface layer is formed, and a polyurethane composition liquid containing collagen powder is applied to the surface and dried to form a leather-like sheet. A resin composition consisting of an aqueous dispersion of polyurethane and/or acrylic resin, an oil or fat, an emulsifier, and an aqueous casein dispersion or solution is applied and dried to produce a leather-like sheet material.

Furthermore, a resin composition solution (II) containing an organic solvent consisting of a resin composition solution of an acrylic resin emulsion or a polyurethane emulsion and a solution of nitrified cotton lacquer, and an oil or fat and an emulsifier is applied to the surface of the leather-like sheet material. A leather-like sheet material is produced by coating and drying to form a coating layer.

The base layer of the present invention may be made of ordinary fibers, such as synthetic fibers such as polyester, polyamide, polyacrylonitrile, polyolefin, and polyvinyl alcohol, chemical fibers such as regenerated cellulose, natural fibers, or special fibers such as polyester, polyamide, etc. , needle punches and high-speed fluids made of ultrafine fibers such as polyacrylonitrile, or multicomponent fibers that can be transformed into ultrafine fiber bundles or special porous fibers by dissolving and removing at least one component. One type of fabric selected from fiber-entangled non-woven fabrics, fiber-raised knitted fabrics, laminated fabrics of non-woven fabrics and knitted-woven fabrics, etc.
The multicomponent fiber is made into an ultrafine fiber by impregnating it with an impregnating composition containing an elastomeric polymer, and then, if necessary, applying a polymer coating composition and solidifying it into a sponge structure in a non-solvent of the polymer. It is a sheet-like material that has been modified into bundled fibers or special porous fibers, and optionally provided with a polymer coating layer mainly composed of an elastic polymer.

If ordinary fibers, especially those made of polyester or polyamide fibers, are used as the base layer, the leather-like sheet will have appropriate stiffness and excellent shape retention, while if one made of ultra-fine fiber bundles is used, When processed into shoes with a flexible texture, the top line will be sharp, and if you use special porous fibers, you will have a moderate waist and light weight, and the surface will have a slimy feel and a solid appearance. This, combined with the deep color tones, creates an artificial leather product that is full of luxury.

Collagen used for the coating layer in the present invention includes animal skin,
A non-fibrous material obtained by processing and refining bones and keys with enzymes, extracting polymeric collagen fibers, causing a cross-linking reaction between collagen fibers, and then crushing them.The average particle size is 10 μm or less, and the appearance is bulky It is a collagen powder with a density of 0.1 to 0.3 g/cff13, such as CX240 and CX manufactured by Showa Denko.
260 and the like. The average particle size of the collagen is 1
If it is larger than 0 μm, a smooth surface cannot be obtained and the surface becomes rough, which is undesirable. Moreover, when the apparent bulk density becomes larger than 0.3 g/c-, the bulk of the collagen particles decreases, so the affinity with the resin decreases and the coating film strength decreases. Furthermore, the stability when dispersed in a polymer solution is poor, and collagen particles precipitate in the solution.
There is a problem in that redispersion cannot be achieved even by stirring.

Moreover, when the apparent bulk density becomes smaller than 0-1 g/am', the strength of the collagen particles decreases and the coating film strength decreases. Therefore, in order to improve adhesion to the resin and obtain a smooth finished surface, it is preferable that the average particle size of collagen be 10 am or less and the apparent bulk density be in the range of 0.1 to 9.3 g/cm<3>. In addition, in the present invention, the apparent bulk density is JIS
K6721.

The weight ratio of the collagen powder to the polyurethane-based polymer is in the range of 1:1 to 2:1. If the amount of collagen powder is small, the characteristics of collagen cannot be fully utilized, and conversely, if the amount of collagen is large, the collagen powder cannot be sufficiently fixed by the polymer, resulting in a decrease in film strength.

In the present invention, the polyurethane mixed with collagen powder is
at least one polymer diol selected from the group of average molecular weights of 500 to 2,500, such as polyester diol, polyether diol, polyester ether diol, polycaprolactone diol, polycarbonate diol, and an organic polyisocyanate, such as aromatic at least one organic polyisocyanate selected from the group of group diisocyanates, aromatic triisocyanates, alicyclic diisocyanates, aliphatic diisocyanates having a cyclic group, triphenylmethane 4.4', 4''-triisocyanates, and the like; ,
It is a polyurethane obtained by reacting a low-molecular compound having at least two active hydrogen atoms as a chain extender.

A polymer composition mainly composed of collagen and polyurethane is applied to a surface as a dispersion in which collagen is dispersed in a polymer solution. Depending on the purpose, coloring agents such as dyes and pigments, stabilizers, antistatic agents, and smoothing agents are added to the coating solution. The coating method is, for example, a roll coating method using a roll with a split surface or a smooth surface roll, a spray coating method, a surface contact method, or the like. A preferred coating method is roll coating from the viewpoint of uniformity of coating.

The coating amount is 5 to 50 g/m based on the weight of dry collagen.
2, preferably in the range of 5 to 30 g/m''.

If the amount of collagen applied is less than 5 g/m'', the entire surface will not be covered with collagen powder, and sufficient adhesion with the resin composition liquid applied on top will not be obtained. However, the strength of the film decreases, resulting in poor durability.

Next, in the present invention, the same polyurethane used in combination with fat and oil and casein can be used as the polyurethane used in combination with the collagen described above, but this polyurethane is ultimately used as an aqueous dispersion. Further, the acrylic resin can be obtained by polymerizing at least one type of acrylic monomer such as methyl acrylate, ethyl acrylate, butyl acrylate, or methyl methacrylate; It is an acrylic resin that is a copolymer of vinyl monomer and other vinyl monomers. This acrylic resin is finally used as an aqueous dispersion. In addition, the oils and fats used as compounding agents for the polymer include natural oils and fats such as hydrogenated oils such as castor oil, linseed oil, cottonseed oil, poppy oil, and tung oil, and unsaturated higher fatty acids such as ricinoleic acid and cruic acid. The emulsifier is an emulsifier consisting of a resin selected from nonionic surfactants, anionic surfactants, etc., an active agent that can emulsify a resin composition, and an oil or fat. be. An aqueous solution or aqueous dispersion of casein is blended thereto to obtain an aqueous resin composition liquid [I].

Furthermore, it is also preferable to add a coloring agent, for example, a coloring agent selected from inorganic pigments, organic pigments, metal complex dyes, acid dyes, etc. to the aqueous resin composition liquid [■]. The preferred resin composition of the aqueous resin composition liquid [I] is Resin 100.
10 to 40 parts by weight of oil and fat, 1 to 1 part by weight of emulsifier
0 parts by weight, 10-50 parts by weight of casein, 1-20 parts by weight of colorant
It is a resin composition blended in a range of parts by weight. Furthermore, if necessary, additives selected from additives such as light stabilizers, antioxidants, water repellents, and oil repellents may be added. This resin composition is apparently used as a water-based dispersion, but the dispersion contains a small amount of organic solvent as long as it does not impair the stability of the liquid, such as ethers, alcohols, ketones, ethyl acetate, butyl acetate, etc. It is also good to add an organic solvent selected from the group of esters such as esters such as esters, and aromatic hydrocarbons such as toluene, benzene, and xylene.

The concentration of the resin composition in the aqueous dispersion is in the range of 5 to 30% by weight, and if the concentration of the resin composition is low, the desired effect cannot be obtained unless the number of applications is increased. Furthermore, if the resin composition has a high concentration, it will not blend well with the collagen-applied surface, making it impossible to achieve the desired effect. The method for applying this aqueous resin composition (I) is, for example, a roll coating method using a roll such as a split roll or a smooth surface roll, a spray coating method, a surface contact method, etc. . A preferred coating method is roll coating because of its uniformity of coating and ease of blending onto the surface.

The coating amount is in the range of 20 to 100 g/m2 of the resin composition. If the amount applied is too small, the objective cannot be fully achieved, but if the amount applied is too large, the strength of the film will be reduced and the appearance will be impaired.

Furthermore, a coating layer may be further provided on the surface of the sheet material to which the resin composition of the present invention has been applied. The resin composition for forming the coating layer is a resin composition liquid consisting of an emulsion of acrylic resin or polyurethane and a solution of nitrified cotton lacquer. Acrylic resin or polylanthanum (R
) and nitrified cotton lacquer (N) in terms of weight ratio (
R)/(N) is in the range of -40/60 to 20/80, and if the amount of nitrified cotton lacquer is small beyond this range, the surface frictional resistance becomes large. On the other hand, if the amount of nitrified cotton lacquer is too large, the surface will feel dry to the touch, and the adhesive strength of the coating layer will become weak, which is undesirable.

The blending ratio of oil and fat and emulsifier to be blended into this resin composition may be the same as that of the water-based resin composition liquid (I) described above. In addition, this resin composition may be used as an apparently aqueous resin composition liquid (I A resin to which at least one organic solvent selected from the group of solvents such as thinner ethers, alcohols, esters such as ethyl acetate and butyl acetate, toluene, benzene, xylene, cyclohexane, cyclohexanone, and ketones is added. It is also good to use composition liquid (II).

The concentration of the resin composition in this resin composition liquid (II) is 5 to
The concentration is 30% by weight, and concentrations outside this range are not preferred because it is difficult to form a sufficiently good coating layer. The method of applying this resin composition liquid (n) to form a coating layer includes, for example, a roll coating method using a roll having a split or a smooth surface roll, a spray coating method, a surface contact method, etc. Apply by method such as method. A preferred coating method is roll coating from the viewpoint of uniformity of coating and high air permeability and moisture permeability of the coating film. The coating amount of the resin composition liquid [I[] is in the range of 20 to 50 g/m'' as a resin composition.If the coating amount of the resin composition is small, a glossier and smoother surface can be finished without impairing flexibility. It's far away.

On the other hand, if the coating amount is too large, the air permeability and moisture permeability will be impaired, and the form of folds and wrinkles will be poor in terms of appearance performance. Also,
When forming a surface coating layer by applying this resin composition, if a coating layer of resin composition Cm) is formed on the surface without applying sufficient resin composition CI), it will be difficult to form a coating layer on the surface during finishing treatment performed later. This results in undesirable problems such as peeling of the coating layer, insufficient embossing, and failure to form wrinkles when rubbed.

Resin composition [I] or resin composition (I) and [■
] is dried and subjected to finishing treatments as a leather-like sheet, such as embossing, softening treatment, surface color tone or gloss adjustment, etc., to form a leather-like sheet. Get the product.

The leather-like sheet material obtained in the present invention has a smooth texture with no tackiness on the surface, is similar to natural leather in fold wrinkle form and drapability, and has a solid appearance and deep color. Moreover, the color tone appears to be dark, and the result is a leather-like sheet-like material with excellent surface strength.

The leather-like sheet material of the present invention is suitable for use in shoe uppers such as sports shoes and men's shoes, bags, bags, clothing, gloves, and the like.

<Examples> Next, embodiments of the present invention will be described using specific examples, but the present invention is not limited to these examples. Note that parts and percentages in the examples are by weight unless otherwise specified.

Example 1 As a base sheet, 20% dimethylformamide (DMF) of polyethylene adipate polyurethane containing a blue colorant was added to an entangled nonwoven fabric of multicomponent fibers containing polyethylene terephthalate as a dispersion component and polyethylene as a dispersion medium component.
) Polyurethane is contained in a porous state in a non-woven fabric of microfiber bundle fibers obtained by impregnating the solution with a solution, further coating the surface in an amount of 150 g/m2, coagulating in a 40% DMF aqueous solution, and dissolving and removing the polyethylene. A sheet having a polyurethane microporous surface layer on one side of the base layer was used. 30% DM of polyester polyurethane is applied to the surface of this base sheet.
100 parts of F solution has an average particle size of 5 μm and an apparent bulk density of 0.2.
A composition solution containing 50 parts of collagen powder of 5 g/cm3 was coated at 50 g/cm3 by a roll coating method using a gravure roll.
Next, the water-based resin composition liquid [I] to be applied to the surface was prepared, including 160 parts of an acrylic resin emulsion (resin concentration 45%), a black pigment-containing casein aqueous dispersion (casein concentration) 30%) 100 parts, vegetable oil emulsion based on castor oil (vegetable oil concentration 50%) 3
Water-based resin composition liquid [I] consisting of 0 parts and 200 parts of water
was adjusted, and an amount of the resin composition (amount of residual components after drying) of 80 g/- was applied by a roll coating method using a gravure roll, and dried. Next, heat embossing was performed at a temperature of 150° C. using a satin-patterned embossing roll to produce a leather-like sheet material A.

The obtained leather-like sheet-like material A had a soft texture and a slimy texture with no tack on the surface, and had a deep blackness similar to natural leather and a solid appearance. .

When men's shoes and women's shoes were manufactured using this leather-like sheet material A, they had a soft calf-like texture, a sharp top line, and a luxurious feel.

Example 2 40 parts of acrylic resin emulsion (resin concentration 45%) was applied to the surface on which the aqueous resin composition of Example 1 was applied and dried.
Nitrified cotton lacquer solution (resin concentration 30%) 100 parts, vegetable oil emulsion mainly composed of castor oil (vegetable oil concentration 50%) 3
Resin composition liquid C]I) consisting of 0 parts and 150 parts of organic solvent is 50g/I) as the resin composition amount (residual composition amount after drying).
A resin composition liquid [■] with a diameter of 100 mm was applied using a roll coating method using a split roll and dried to form a coating layer.Next, heat embossing was performed using an embossing roll with a kerf-like pattern, and further rolling was performed. It was processed to produce a leather-like sheet material B.

The obtained leather-like sheet-like material B has a soft texture, a folded wrinkle pattern on the surface similar to natural leather, and a slimy texture,
It had a deeper hue and a solid appearance that was more similar to natural leather than the leather-like sheet material A.

Comparative Example 1 In Example 1, the average particle size of the collagen powder was 30.
A leather-like sheet material C was prepared in the same manner except that collagen powder having an apparent bulk density of 0.5 g/cm" was used.

The leather-like sheet material C has a slimy feel without tackiness on the surface, and although it has a deep blackness similar to natural leather and a heavy appearance, it has a water-based resin composition [I].
] The resin layer was easily peeled off, and the surface was easily scratched.

Comparative Example 2 The aqueous $11Wi composition liquid [technique] used in Example 1 was applied in the same manner as in Example 1 without applying the polyurethane and collagen composition to the surface of the base sheet of Example 1, and dried, resulting in an acrylic surface. A sheet-like material with a coating layer of the resin composition formed thereon was heat-embossed under the same conditions, but under the conditions of Example 1, the surface coating layer peeled off due to the high temperature, and the embossing was not applied. There wasn't. For this purpose, heat embossing was performed by lowering the embossing temperature to 110° C., and the product was further rubbed to produce a leather-like sheet-like material. The resulting leather-like sheet-like material had a poor appearance because it was not sufficiently embossed, and furthermore, the adhesiveness of the surface resin was poor, causing peeling in some places, making it unsuitable for practical use.

Example 3 As a base sheet, a sheet obtained by impregnating and coagulating polyethylene adipate polyurethane in the same manner as in Example 1 was used in an entangled nonwoven fabric of short polyester fibers having a fineness of 1.5 denier. A composition solution prepared by adding 40 parts of collagen powder with an average particle size of 7 μm and an apparent bulk density of 0.2 g/c to 100 parts of a 30% DMF solution of polyester-ether polyurethane was applied to the surface of this base sheet using a gravure roll. Roll coating method used: 40g/m2 coating and drying. On this surface, a polycarbonate-based polyurethane emulsion (resin concentration 40%) 1 was applied as the water-based resin composition liquid (I).
80 parts, casein aqueous dispersion containing black pigment (casein concentration 30%), 100 parts, vegetable oil emulsion (vegetable oil concentration 50%)
) 30 parts, hindered amine light stabilizer 1 part and water 2
A water-based resin composition solution (CI) consisting of 0.00 parts was prepared, and an amount of the water-based resin composition solution (residual component amount after drying) of 65 g/m2 was applied by a roll coating method, and dried to form a sheet-like material. I got it. Furthermore, a resin composition liquid (II
), 50 parts of a polyurethane mixed emulsion (resin concentration 40%) of 85 parts polycarbonate polyurethane and 15 parts polyoxyethylene polyurethane, 100 parts nitrocotton lacquer solution (resin concentration 30%), and 2.0 parts thermal pigment.
Prepare a resin composition solution [■] consisting of 5 parts, 30 parts of a vegetable oil emulsion (vegetable oil concentration: 50%), 1.5 parts of a hindered amine stabilizer, and 150 parts of an organic solvent.
(2)] is applied to the surface of the sheet-like material C with a resin composition solution (II) having a resin composition amount (residual composition amount after drying) of 40 g/m2 by roll coating method, and dried to form a coating layer. did. The surface of this sheet-like material was heated and embossed at a temperature of 150° C. using an embossing roll with a calf-like pattern to obtain a leather-like sheet-like material E.

The obtained leather-like sheet material E had a moderate firmness, a moist and slimy surface, and a deep blackness. Men's shoes and camera cases were made using this leather-like sheet material E, and both had excellent shape-forming and shape-retaining properties, and together with their unique sliminess and color tone, they had high commercial value. T-ko.

Example 4 As a base sheet, a 20% dimethylformamide (DMF) solution of polyethylene adipate polyurethane containing a blue colorant was applied to an entangled nonwoven fabric of multicomponent fibers containing 6-nylon as a dispersion medium component and polystyrene as a dispersion component. and then apply 40% DMF on the surface in an amount of 150g/m".
A sheet was used which had a polyurethane microporous surface layer on one side of a base layer formed by a nonwoven fabric made of special porous fibers obtained by dissolving and removing polystyrene after coagulation in an aqueous solution and containing polyurethane in a porous state. A 30% DMF solution of polyester-ether polyurethane 1 was applied to the surface of this base sheet.
00 parts average particle size 7 um s apparent bulk density 0-2 g
A composition solution containing 40 parts of collagen powder of 40 g/cm" was applied by roll coating using a gravure roll.
Apply and dry. A polycarbonate-based polyurethane emulsion (
An aqueous system consisting of 180 parts (resin concentration: 40%), 100 parts of a casein aqueous dispersion containing black pigment (casein concentration: 30%), 30 parts of a vegetable oil emulsion (vegetable oil concentration: 50%), 1 part of a hindered amine light stabilizer, and 200 parts of water. Resin composition liquid (
I) was adjusted, and an amount of the water-based resin composition acid solution that would give a resin composition amount (residual component amount after drying) of 65 g/m was applied by roll coating method, and dried to obtain a sheet.Then, the surface coating was applied. The surface of the membrane layer was heated and embossed with a satin pattern embossing roll to obtain a leather-like sheet. This leather-like sheet was further rubbed and finished.

The obtained leather-like sheet material has a heavy appearance but is lightweight, and has a slimy surface with no tackiness and a deep blackness.
The wear test result of 1000 times is grade 1 (no abnormality).

This leather-like sheet material was a suitable material for bags, school bags, and sports shoes.

<Effects of the Invention> The leather-like sheet material of the present invention has a surface that has a low rebound feeling, is flexible, has a slimy feel with no tackiness to the touch, and has low scratch strength and abrasion strength. , a leather-like sheet material with excellent surface layer breaking strength. Furthermore, it has a surface and fold wrinkle morphology similar to natural leather, and is a leather-like sheet-like material that has visual performance that gives a feeling of solidity and softness.

Claims (2)

[Claims] (1) In a leather-like sheet-like material consisting of a base layer containing a polymer mainly composed of an elastic polymer in the fiber aggregate and a polymer coating layer mainly composed of an elastic polymer, the surface of the coating layer is is a layer consisting of a non-fibrous collagen powder with an average particle size of 10 μm or less and an apparent bulk density of 0.1 to 0.3 g/cm^3 and a polymer mainly composed of polyurethane, polyurethane and/or acrylic resin, oil and fat, and A leather-like sheet material characterized by being formed by laminating layers made of casein. (2) A leather-like sheet material according to item 1, characterized in that the surface thereof is further laminated with a layer consisting of an acrylic resin or polyurethane, a nitrocotton lacquer, and an oil.